“A holocron, short for holographic chronicle[1], was an organic crystal-lattice device which stored phenomenal quantities of data guarded by the device’s gatekeeper. Holocrons were used to hold information on force techniques and instruction manuals by force users beginning with the Sith and later the Jedi some three thousand years later.” – Wookieepedia: The Star Wars Wiki http://starwars.wikia.com/wiki/Holocron